TOYOTA AVENSIS 2005 Service Repair Manual

05±676
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)DTC No.
DTC Detecting ConditionTrouble Area
P2120
Condition (a) continues for 0.5 sec. or more:
(a) VPA less than 0.2 V and VPA2 greater than 0.97 deg, or
VPA greater than 4.8 V
P2122
Conditions (a) and (b) continue for 0.5 sec. or more:
(a) VPA less than 0.2 V
(b) VPA2 greater than 0.97 deg
P2123Condition (a) continues for 2.0 sec. or more:
(a) VPA greater than 4.8 V
P2125
Condition (a) continues for 0.5 sec. or more:
(a) VPA2 less than 0.5 V and VPA greater than 0.97 deg, or
VPA2 greater than 4.8 V and VPA greater than 0.2 V but les
than 3.45 V

Open or short in accelerator pedal position sensor circuit

Accelerator pedal position sensor

ECM
P2127
Conditions (a) and (b) continue for 0.5 sec. or more:
(a) VPA2 less than 0.5 V
(b) VPA greater than 0.97 deg
P2128
Conditions (a) and (b) continue for 2.0 sec. or more:
(a) VPA2 greater than 4.8 V
(b) VPA greater than 0.2 V but less than 3.45 V
P2138
Condition (a) or (b) continues for 2.0 sec. or more:
(a) Difference between VPA and VPA2 less than 0.02 V
(b) VPA less than 0.2 V and VPA2 less than 0.5 V
HINT:
After confirming ºDTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138º, use the hand±held tester
to confirm the accelerator pedal position sensor output voltage.
Accelerator pedal position expressed as voltage output
Trouble areaAccelerator pedal releasedAccelerator pedal depressed
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VC circuit open0 V0 V0 V0 V
VPA circuit open or ground short0 V1.5 to 2.9 V0 V3.5 to 5.5 V
VPA2 circuit open or ground short0.5 to 1.1 V0 V2.5 to 4.6 V0 V
EP circuit open5 V5 V5 V5 V

A76878
A20
Accelerator Pedal
Position Sensor
VCP16 (LHD)
E926ECM
VCPA B
4 (RHD)
(LHD)B
(LHD) 5
IG2
B
(RHD)
VPA15 (LHD)
E922
VPA G
5 (RHD)
(LHD)G
(LHD) 6
IG2
G
(RHD)
EP13 (LHD)
E928
EPA Y
1 (RHD)
(LHD)Y
(LHD) 1
IG2
Y
(RHD)
VCP24 (LHD)
E927
VCP2 B
6 (RHD)
(LHD)B
(LHD) 7
IG2
B
(RHD)
VPA22 (LHD)
E923
VPA2 W
2 (RHD)
(LHD)W
(LHD) 2
IG2
W
(RHD)
EP21 (LHD)
E929
EPA2 Y
3 (RHD)
(LHD)Y
(LHD) 3
IG2
Y
(RHD)
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±677
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand±held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running
or stopped, the engine was warmed up or not, etc. at the time of the malfunction.

FI7052DepressedReleased
A82236
VCP1VCP2
EP2
EP1
LHD Accelerator Pedal Assy
321
6 54
RHD
Accelerator Pedal Assy
321
65 4
VCP2EP2
EP1
VCP1
05±678
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
1READ VALUE OF HAND±HELD TESTER(ACCEL POS #1 AND ACCEL POS #2)
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2º and read
its value displayed on the hand±held tester.
Standard:
Accelerator pedalACCEL POS #1ACCEL POS #2
Released0.5 to 1.1 V1.5 to 2.9 V
Depressed2.5 to 4.6 V3.5 to 5.5 V
OKREPLACE ECM (See page 10±65)
NG
2INSPECT ACCELERATOR PEDAL ASSY(ACCELERATOR PEDAL POSITION SENSOR)
(a)Disconnect the accelerator pedal position sensor con-
nector.
(b)Measure the resistance between each terminal.
Standard (LHD):
Symbols (Terminal No.)Resistance
EP1 (3) ± VCP1 (6)225to475k
at20
C(68
F)EP2 (1) ± VCP2 (4)2.25 to 4.75 k
at 20
C (68
F)
Standard (RHD):
Symbols (Terminal No.)Resistance
EP1 (1) ± VCP1 (4)225to475k
at20
C(68
F)EP2 (3) ± VCP2 (6)2.25 to 4.75 k
at 20
C (68
F)
NGREPLACE ACCELERATOR PEDAL ASSY
(See page 10±66)
OK

A66060ECM ConnectorEPA (±)VCPA (+)
E9
EPA2 (±)
VCP2 (+)
A66060ECM Connector EPA (±)VPA (+)
E9
EPA2 (±)
VPA2 (+)
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±679
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT ECM(VCPA AND VCP2 VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the specified terminals of
the E9 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
VCPA (E9±26) ± EPA (E9±28)45to55VVCP2 (E9±27) ± EPA2 (E9±29)4.5 to 5.5 V
NGREPLACE ECM (See page 10±65)
OK
4INSPECT ECM(VPA AND VPA2 VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the specified terminals of the E9 ECM connector.
Symbols (Terminal No.)Symbols (Terminal No.)
Accelerator pedal positionVPA (E9±22)
± EPA (E9±28)VPA2 (E9±23) ± EPA2 (E9±29)
Released0.5 to 1.1 V1.5 to 2.9 V
Depressed2.5 to 4.6 V3.5 to 5.5 V
OKREPLACE ECM (See page 10±65)
NG

A54384
EP2EP1VPA2
VCP2 VPA1VCP1
Wire Harness Side
LHD
A20 Accelerator Pedal Position
Sensor Connector
A54384
EP1EP2VPA2
VCP1 VPA1VCP2
Wire Harness Side
RHD
A20 Accelerator Pedal Position
Sensor Connector
A81091
E9
ECM Connector VPA
EPA VCPA
VPA2
EPA2 VCP2
05±680
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK HARNESS AND CONNECTOR(ACCELERATOR PEDAL POSITION SENSOR ± ECM)
(a)Disconnect the A20 accelerator pedal position sensor
connector.
(b)Disconnect E9 the ECM connector.
(c)Check for continuity between the wire harness side con- nectors.
Standard (LHD):
(Check for open)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) ± VPA (E9±22)
EP1 (A20±3) ± EPA (E9±28)
VCP1 (A20±6) ± VCPA (E9±26)ContinuityVPA2 (A20±2) ± VPA2 (E9±23)Continuity
EP2 (A20±1) ± EPA2 (E9±29)
VCP2 (A20±4) ± VCP2 (E9±27)
(Check for Short)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) or VPA (E9±22) ± Body ground
EP1 (A20±3) or EPA (E9±28) ± Body ground
VCP1 (A20±6) or VCPA (E9±26) ± Body groundNocontinuityVPA2 (A20±2) or VPA2 (E9±23) ± Body groundNo continuity
EP2 (A20±1) or EPA2 (E9±29) ± Body ground
VCP2 (A20±4) or VCP2 (E9±27) ± Body ground
Standard (RHD):
(Check for open)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) ± VPA (E9±22)
EP1 (A20±1) ± EPA (E9±28)
VCP1 (A20±4) ± VCPA (E9±26)ContinuityVPA2 (A20±2) ± VPA2 (E9±23)Continuity
EP2 (A20±3) ± EPA2 (E9±29)
VCP2 (A20±6) ± VCP2 (E9±27)
(Check for Short)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) or VPA (E9±22) ± Body ground
EP1 (A20±1) or EPA (E9±28) ± Body ground
VCP1 (A20±4) or VCPA (E9±26) ± Body groundNocontinuityVPA2 (A20±2) or VPA2 (E9±23) ± Body groundNo continuity
EP2 (A20±3) or EPA2 (E9±29) ± Body ground
VCP2 (A20±6) or VCP2 (E9±27) ± Body ground
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM (See page 10±65)

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±673
AVENSIS REPAIR MANUAL (RM1018E)
DTCP1601INJECTOR CORRECTION CIRCUIT
MALFUNCTION (EEPROM)
CIRCUIT DESCRIPTION
DTC No.DTC Detection ConditionTrouble Area
P1601

Injector compensation value is not registered
(1 trip detection logic)

Wrong injector compensation value is registered
(1 trip detection logic)
Injector compensation code

ECM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \b
 . Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, it is useful for determi\
ning whether the vehicle was running
or stopped, the engine was warmed up or not, etc. at the time of the malfu\
nction.
1CHECK INJECTOR COMPENSATION CODE (See page 05±528)
NGSET INJECTOR COMPENSATION CODE (See page 05±528)
OK
REPLACE ECM (See page 10±65)
05CQ2±01

A81485
Fuel Pressure
Pressure Discharge Valve Operation Under Sudden Deceleration
Pressure Discharge Valve w/o Pressure Discharge Valve
Close
Accelerator Pedal
Opening Angle
Open
Close
Open
w/ Pressure Discharge Valve
TargetFuel Pressure TimeLong Time
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±663
AVENSIS REPAIR MANUAL (RM1018E)
DTCP1271FUEL REGULATOR CIRCUIT MALFUNCTION
(EDU DRIVE)
DTCP1272FUEL PRESSURE REGULATOR MALFUNCTION
HINT:

For more information on the pressure discharge valve and the common rail sy\
stem, see page 05±517.

For more information on the EDU, see page 05±604.

If P1271 and/or P1272 are present, use the diagnostic trouble code matrix for fuel syste\
m, see page
05±517.
CIRCUIT DESCRIPTION
The ECM controls the internal fuel pressure of the common rail by opening a\
nd closing the pressure dis-
charge valve. When sudden deceleration is occurred, the internal fuel pressure will temporarily become
higher than usual and combustion noise may result, therefore the ECM will open the valve temporarily to
discharge the pressure inside the common rail. Also, the pressure discharge valve open\
s when the ignition
switch is turned OFF, and the internal pressure is then promptly discharged.
05CQ1±01

A81505
Pressure Discharge Valve Cross Section Diagram
From Common Rail
(High Pressure)To Fuel Tank
(Low Pressure)
Valve
Solenoid
05±664
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
HINT:
The solenoid valve of the pressure discharge valve is the same type of the injector solenoid valve.
DTC No.DTC Detection conditionTrouble Area
P1271
Open or short in pressure discharge valve circuit. There is no
valve opening confirmation signal (IJF) from EDU to ECM,
despite the ECM sending valve opening command signal
(PRD) after the engine has been started (1 trip detection).
Open or short in pressure discharge valve circuit

Open or short in pressure discharge valve itself

EDU

ECM
P1272
Pressure discharge valve closed malfunction. Actual pressure
decreasing rate deviates from the simulated pressure drop rate
by the ECM after the ignition switch is turned OFF (2 trip detec-
tion).
Open or short in pressure discharge valve circuit (P1271 is
set simultaneously)

Pressure discharge valve

Supply pump

ECM
HINT:
After confirming DTC ºP1271 and/or P1272º, use the hand±held tester to confirm the fuel pressure inside
common rail in the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COMN RAIL PRESSº.
Engine SpeedFuel Pressure (MPa)
IdlingApprox. 30 to 40
Running the engine at 2,500 rpm (No engine load)Approx. 50 to 100

A81500
P1271 Malfunction Detection
ECMCommand Signal (PRD)
EDU
Confirmation Signal (IJF)
Pressure Discharge Valve
Command Signal
Pressure Discharge Valve
Confirmation SignalPRD
IJFON
OFF
Normal
Abnormal
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±665
AVENSIS REPAIR MANUAL (RM1018E)
MONITOR DESCRIPTION
P1271 (Open or short in pressure discharge valve circuit):
This DTC will be set if there is no valve opening confirmation signal (IJF) from the EDU to the ECM, despite
the ECM commanding the pressure discharge valve to open with the EDU. This DTC refers to open or short
malfunction of the pressure discharge valve circuit, therefore the malfunction that the valve is stuck open
or closed can be excluded.
The EDU monitors the current supplied to the pressure discharge valve, and the EDU interprets the IJF sig-
nal is low if the current exceeds the specified level, and the EDU indicates that there is the current in the
pressure discharge valve.
If this DTC is present, the ECM enters fail±safe mode and limits the engine power. The fail±safe mode will
continue until the ignition switch is turned OFF.
P1272 (Closed malfunction of the pressure discharge valve):
The pressure discharge valve will open and discharge the internal fuel pressure of the common rail to the
fuel tank when the ignition switch is turned OFF. In this event, the ECM compares the actual dropping rate
of the internal fuel pressure and the simulated dropping rate. If the ECM judges the actual dropping rate is
smaller than the simulation, the ECM then interprets this as the valve has stuck closed and set this DTC.
This DTC detection will be activated if the internal fuel pressure does not drop below the specified level after
the ignition switch has been turned OFF.
If this DTC is present, the ECM enters fail±safe mode and limits the engine power. The fail±safe mode will
continue until the ignition switch is turned OFF.
MONITOR STRATEGY
P1271:
Required sensorsEDU
Frequency of operationContinuous
Duration3 sec.
CHK ENG operation1 driving cycles

05±666
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
P1272:
Required sensorsFuel pressure sensor
Frequency of operationOnce per driving cycle
Duration1 sec.
CHK ENG operation2 driving cycles
TYPICAL ENABLING CONDITIONS
P1271:
Specification
Drive the vehicle at 50 km/h with the 3 rd transmission gear and then decelerate it by completly releasing the accelerator pedal
P1272:
ItemSpecificationItemMinimumMaximum
Fuel pressure30 MPa (306 kgf/cm2, 4,351 psi)±
Fuel temperature0
C±
Battery voltage11 V±
The monitor will not run if the fuel pressure sensor, or pressure discharge valve circuit, or fuel temp. sensor is malfunctioning
TYPICAL MALFUNCTION THRESHOLDS
P1271:
Threshold
If the confirmation signals from the EDU is not present, despite the ECM sending the command signals regularly during decelerating
P1272:
Threshold
If the internal pressure stays beyond the specified level after the ignition switch was turned OFF